Women and men between the ages of 45 and 64 were more than twice as likely to have had knee replacement surgery in 2009 than in 1997, recent data from the Agency for Healthcare Research and Quality (AHRQ) show. The rates among women were even higher. Knee replacement surgery is most common in people whose knees have been damaged by osteoarthritis (OA), rheumatoid arthritis, or injury. Due to their age and fondness for sports, Baby Boomers fit neatly into each category.
The percentage of people who have osteoarthritis, the most common type of arthritis, grows with age. About 27 million Americans have this condition, and, after age 45, it is more common in women. Osteoarthritis occurs when the cartilage that coats the end of each bone breaks down. This can cause the bones to rub against each other, causing pain and stiffness.